Various Digital Memory Behaviors of Functional Aromatic Polyimides Based on Electron-Donor and Acceptor Substituted Triphenylamines
SCIE
SCOPUS
- Title
- Various Digital Memory Behaviors of Functional Aromatic Polyimides Based on Electron-Donor and Acceptor Substituted Triphenylamines
- Authors
- Yong-Gi Ko; Wonsang Kwon; Hung-Ju Yen; Cha-Wen Chang; Dong Min Kim; Kyungtae Kim; Suk Gyu Hahm; Taek Joon Lee; Guey-Sheng Liou; Ree, M
- Date Issued
- 2012-05-08
- Publisher
- AMER CHEMICAL SOC
- Abstract
- A series of aromatic polyimides (PIs) were synthesized via the polymerization of 3,3',4,4'-diphenylsulfonyltetracarboxylic dianhydride with 4,4'-diaminotriphenylamine derivatives containing hydrogen, cyano, methoxy, or dimethylamine substituents. These PIs were thermally and dimensionally stable and produced high-quality thin films when applied in a conventional spin-coating process. Their structure and properties were characterized. Nanoscale thin films of the PIs demonstrated excellent electrical memory performance, with high stabilities and ON/OFF current ratios. The memory characteristics were found to be tunable by varying the substituents; nonvolatile write-once-read-many-times memory behavior, nonvolatile ON/OFF switching type memory behavior, and volatile dynamic random access memory behavior were observed. The memory characteristics were substantially influenced by the electron-accepting cyano- and electron-donating dimethylamine substituents but were apparently not affected by the electron-donating methoxy substituent. In addition, the film density was a significant factor influencing the observed memory behaviors, with larger film densities causing lower OFF-current levels. However, the critical switching-on voltage varied very little as the substituents were changed and was measured to be approximately +/- 2 V. All of the memory behaviors were found to be governed by a mechanism involving trap-limited space-charge-limited conduction and local filament formation. Overall, all of the PIs assessed in the present work were found to be suitable active materials for the low-cost mass production of high-performance, programmable unipolar memory devices that can be operated with very low power consumption, high ON/OFF current ratios, and high thermal and dimensional stability.
- Keywords
- X-RAY-SCATTERING; LIQUID-CRYSTAL ALIGNMENT; ORGANOSILICATE DIELECTRIC FILMS; DEFINED BRUSH POLYIMIDE; FULLY RODLIKE BACKBONE; THIN-FILMS; SURFACE-MORPHOLOGY; SEGMENTAL REORIENTATIONS; PHOTOREACTIVE POLYIMIDE; MOLECULAR-REORIENTATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16425
- DOI
- 10.1021/MA300311D
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- MACROMOLECULES, vol. 45, no. 9, page. 3749 - 3758, 2012-05-08
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